Ketorolac Intravenous Regional Analgesia in Lower Limb Surgeries

This is a randomized controlled trial that tests the effecacy of the intravenous regional ketorolac in lower limb orthopedic surgeries with spinal anesthesia. The investigators will compare the effect of 30 mg ketorolac without local anesthetic in the injected intravenously in an isolated lower limb (with torniquet) versus intravenous 30 mg ketorolac administered 10 minutes before toniquet pressuerization on the postoperative analgesia. All patients will receive spinal anesthesia aiming for at least T12-L1 level. Postoperative standard analgesia will be paracetamol and diclofenac, given for both groups.